Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead

被引：2

作者：

Sokhoyan, V. ^{[1
]}

Prakhov, S. ^{[1
,2
]}

Fix, A. ^{[3
]}

Abt, S. ^{[4
]}

Achenbach, P. ^{[1
]}

Adlarson, P. ^{[1
]}

Afzal, F. ^{[5
]}

Aguar-Bartolome, P. ^{[1
]}

Ahmed, Z. ^{[6
]}

Altangerel, K. ^{[1
]}

Annand, J. R. M. ^{[7
]}

Arends, H. J. ^{[1
]}

Bantawa, K. ^{[8
]}

Bashkanov, M. ^{[9
]}

Beck, R. ^{[5
]}

Biroth, M. ^{[1
]}

Borisov, N. S. ^{[10
]}

Braghieri, A. ^{[11
]}

Briscoe, W. J. ^{[12
]}

Cherepnya, S. ^{[13
]}

Cividini, F. ^{[1
]}

Collicott, C. ^{[14
,15
]}

Costanza, S. ^{[11
,16
]}

Denig, A. ^{[1
]}

Dieterle, M. ^{[4
]}

Downie, E. J. ^{[12
]}

Drexler, P. ^{[1
]}

Bondy, M. I. Ferretti ^{[1
]}

Fil'kov, L. V. ^{[13
]}

Gardner, S. ^{[7
]}

Garni, S. ^{[4
]}

Glazier, D. I. ^{[7
,9
]}

Gorodnov, I. ^{[10
]}

Gradl, W. ^{[1
]}

Gunther, M. ^{[4
]}

Gurevich, G. M. ^{[17
]}

Heijkenskjoeld, L. ^{[1
]}

Hornidge, D. ^{[18
]}

Huber, G. M. ^{[6
]}

Kaser, A. ^{[4
]}

Kashevarov, V. L. ^{[1
,10
]}

Kay, S. ^{[6
]}

Keshelashvili, I. ^{[4
]}

Kondratiev, R. ^{[17
]}

Korolija, M. ^{[19
]}

Krusche, B. ^{[4
]}

Lazarev, A. ^{[10
]}

Livingston, K. ^{[7
]}

Lutterer, S. ^{[4
]}

MacGregor, I. J. D. ^{[7
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[2] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[3] Tomsk Polytech Univ, Tomsk 634034, Russia

[4] Univ Basel, Inst Phys, CH-4056 Basel, Switzerland

[5] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[6] Univ Regina, Regina, SK S4S 0A2, Canada

[7] Univ Glasgow, SUPA Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[8] Kent State Univ, Kent, OH 44242 USA

[9] Univ York, Dept Phys, York Y010 5DD, N Yorkshire, England

[10] Joint Inst Nucl Res, Dubna 141980, Russia

[11] INFN Sez Pavia, I-27100 Pavia, Italy

[12] George Washington Univ, Washington, DC 20052 USA

[13] Lebedev Phys Inst, Moscow 119991, Russia

[14] Dalhousie Univ, Halifax, NS B3H 4R2, Canada

[15] St Marys Univ, Halifax, NS B3H 3C3, Canada

[16] Univ Pavia, Dipartimento Fis, I-27100 Pavia, Italy

[17] Inst Nucl Res, Moscow 125047, Russia

[18] Mt Allison Univ Sackville, Sackville, NB E4L 1E6, Canada

[19] Rudjer Boskovic Inst, HR-10000 Zagreb, Croatia

[20] Univ Massachusetts, Amherst, MA 01003 USA

[21] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

来源：

PHYSICS LETTERS B | 2020年 / 802卷

基金：

瑞士国家科学基金会; 英国科学技术设施理事会; 美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

TAGGED PHOTON SPECTROMETER; REACTION GAMMA-P; PION-PHOTOPRODUCTION; 1ST MEASUREMENT; CROSS-SECTIONS; I-S; RESONANCE; NUCLEON; MESONS; PHOTOABSORPTION;

D O I：

10.1016/j.physletb.2020.135243

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The beam-helicity asymmetry was measured, for the first time, in photoproduction of pi(0)eta pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The results are compared to an earlier measurement on a free proton and to the corresponding theoretical calculations. The Mainz model is used to predict the beam-helicity asymmetry for the nuclear targets. The present results indicate that the photoproduction mechanism for pi(0)eta pairs on nuclei is similar to photoproduction on a free nucleon. This process is dominated by the D-33 partial wave with the n Delta(1232) intermediate state. (C) 2020 The Author(s). Published by Elsevier B.V.

引用

页数：8

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